Answer:
11/4 seconds
Step-by-step explanation:
We can see from the given equation that the height at the diving board is h = 3.
This is because the h(t) equation has that +3 at the end, which denotes the initial height of the diver, the height when he is standing on the board before jumping.
To find where h(t) = 3 is true, we need to set h(t) equal to 3 and solve for t.
h(t) = 3
h(t) = -4t^2 + 11t + 3 = 3
-4t^2 + 11t + 3 - 3 = 0
-4t^2 + 11t = 0
t*(-4t + 11) = 0
so h(t) = 3 when t = 0 and when t = 11/4 sec
we already know that at t = 0 the height is 3, it is the initial height given from the equation, so we want to use the other solution for t.
the diver is back at the height of the diving board at t = 11/4 sec
Answer:
π/3 units
Step-by-step explanation:
arc length = 2πr(°/360)
= 2π*3(20/360)
= π/3 units
Answer:
4000Pa
Step-by-step explanation:
Pressure is force(thrust) per unit area.
Pressure=Force/Area
P=F/A
A.T.Q
Applied force=800N
Area=0.2m²
Pressure=800/0.2=4000Pa
Let x = width length = 5x -10 (10 ft less than 5 times width) A = l * w A = (5x-10)*x 2640 = 5x2 -10x 5x2 -10x -2640=0 divide by 5 x2 -2x - 528 = 0 (x-24)(x+22)=0 x-24=0 x=24 width (the other factor would give us a negative length) length = 5*24 -10 length = 110
